Wheel-truing fixture



Nov. 5, 1929. c. L. OTT

WHEEL mums FIXTURE Filed March 10. 1928 2 Sheets-Sheet 1 l I I I I Fl]uuuunn f INVENTOR.

CONRAD L... O'T'T'.

A ORNEY.

Nov. 5, 1929. c. L. OTT

WHEEL TRUING FIXTURE Filed March 10, 1,928 2 Sheets-Sheet 2 INVENTOR.

c ONRHD 1.. OT'TZ Patented Nov. 5, 1929 V UNITED, STATES PATENT OFFICE,"CONRAD L. OTT, OF WAYNESBORO, PENNSYLVANIA, ASSIGNOR TO THE LANDISTOOL 00., OF WAYNESBORO; PENNSYLVANIA, A CORPORATION WHEEL-TRUINGFIXTURE Application filed March 10, 1928. Serial No. 260,622.

My invention relates to wheel truing fixtures for multiple wheelgrinding machines and it is an object of the invention to provide meanswhereby a, single diamond may be used to dress a plurality of wheels ofvarying diameters mounted on a common Wheel spindle. I

A further object of the invention is to provide a wheel truing devicewhich may be,

adjusted to provide for variation in the degree of hardness of thegrinding wheels.

Another object is to provide a non-rotatable mounting for the cuttingtool.

Further objects and advantages will hecome apparent as the descriptionproceeds. Referring to the accompanying drawings which are made a parthereof and on which similar reference characters indicate similar parts,Figure 1 is a plan view of the device, Figure 2, a section'on line 2-2of Fig. 1, Figure 3, an end view of an adjustable gage block, and

Figure 4, a partial end elevation of the device, parts being shown insection.

l/Vith truing devices adapted for use in grinding machines having aplurality of grinding wheels of different diameters,it has heretoforebeen customary to provide a sep arate truing or cutting tool for eachwheel and tools were mounted in a single bracket and movable to positionto dress all of the wheels at the same time. A serious objection to thismethod of wheel truing lies in the fact that all the tools would not beworn uniformly because of a difference in the hardness of the grindingwheels. WVith my device I use a single dressing tool which has a fixedposition for dressing one of the wheels and is adjustable to one or morepositions for dressing one or more additional wheels. The adjustablepositions may also provide for variation in the hardness of the grindingwheel by taking account of the wearing effect on the cutting tool madeby the grinding wheel. I

In the drawings numeral 10 indicates the reciprocable carriage of agrinding machine on which may be mounted a base 11. This base in turncarries a slide 12 removably mounted thereon. A plunger 13 is slidablymounted within the slide 12. This plunger carries an extension 14 in thefront end on which is mounted the cutting or dressing tool 15. 16 and 17indicate the head stock and tail stock which carry the work 18. In thisinstance,-the work has cylindrical portions 19 and 20 of differentdiameters which of a bolt or screw 23 and a U-shaped washer 24 as shownin Fig. 2. In order to remove the slide from the base 11, the screw ..3is loosened and the washer 24 slipped out whereupon the slide may belifted from the base. The plunger'13 is secured inposition on the slide12 by means of a screw 25 screw threaded through a cover 26 the end ofthe screw resting on a clamping block 27 The cover is held upon theslide 12 by means of screws or bolts 28. The slide 13 is somewhatV-shaped in cross section and fits in a corresponding groove. Thisprevents rotation of the plunger in its seat. Any rotation of thisplunger would throw the cutting tool out of position with respect to thegrinding wheel. The plunger 13 has an undercut side at 29 at its rearand a knob or handle 30 by means of which it is slid-ably adjusted inthe slide 12. The slide 12v has a portion 31 which extends up into therecess 29 on' the rear of the plunger. This portion 31 has a hardenedpin 32 firmly seated in a bore herein. A corresponding hardened pin isseated in the plunger 13 adjacent the pin 32.

means of which pin the block is held to the slide. A pin 89 through theslot supports the gage block suspended from the pin. The twowedge-shaped halves of the gage block are clamped together by screws 40.These screws fit loosely in holes in the blocks in such a way as toallow a slight relative endwise movement of the wedge members of theblock in order to vary the thickness of the lock.

Positioned in a bore ll in the plunger is a compression spring 42 whichseats injthe bottom of the bore and against the upstanding portion 31 onthe rear of the slide 12. This spring to urge the plunger forward sothat the hardened pin 33 is held against the hardened pin 32 or againstthe age block when that is in position as shown in Fig. i.

l he operation of the device is as follows: lVith the gage block 3% in alowered position the pin 38 will rest against the pin 32 and the cuttingtool will be in the position sho vn in dotted lines in Fig. 1 in orderto dress the grinding wheel 21. When this wheel has been dressed, thegage block 18 insertcd between the pins 33 and 32 whereupon the plungeris held in the position where the cutting tool will dress tie grindingwheel 22, such as shown in full lines in Fig. 2. The thickness of thegage block is adjusted accurately to equal the value of the differencesbetween the two radii of the portions 19 and 20 of the work piece 18which is to be ground. It may occur that the grinding wheel 21 is harderthan the grinding wheel 22 and therefore that in dressing this wheel thecutting tool will be slightly worn'a wa'y. The nature of the work alsomay be such as to cause unequal'wear on the grinding wheels. In order toprovide for this, the gage block, shown in Fig. 3, is slightlyadjustable for thickness, the screws 40 are loosened and thewedge-shaped halves of the gage moved so as to change the thickness ofthe block by an amount equal to the amount the cutting tool is wornduring a dressing operation. Instead of a block having wedgeshaped'members slidable upon each other, any adjustable n'ieans may be used inplace of the block 3 f.

After the truing operation, above described, the screw 23 is loosenedand the washer 2a removed whereupon the slide 12 may be lifted from thebase 11 until itis desired again to dress the wheels.

It will be obvious to those skilled in the art that various changes maybe made in my device without departing from the spirit of the invention,and I, therefore, do not limit myself to what is shown in the drawingsand described in the specification, but only as set forth in theappended claims.

Having thus fully described my said invention, what I claim as new anddesire to secure by Letters Patent, is:

1. A wheel truing fixture comprising a base, a slide removably mountedthereon, a plunger in said slide, a dressing tool carried by saidplunger, resilient means for urging said plunger in a fixed forwardposition for dressing one wheel, and a block movable to engage aportionof the plunger tohold it in a position back of the fixed position todress a wheel of a diameter greater than that of the first named wheel,substantially as set forth.

2. A truing fixture for a plurality of grinding wheels comprising aslide, a plunger on saidslide, means for holding the slide in a fixedposition for dressing one wheel, and a block movable to engage a portionof the plunger for holding it-inan adjusted position for dressing awheel of a different diameter, substantially as set forth.

3. AWheel truing device for a plurality of grinding wheels of differentdiameters co1nprising a slide. a plunger in said slide, a dressing toolin said plunger, acontact point on saidslide enga-geable-by a contactpoint on said plunger to position the plunger to dress one of saidwheels, a block vertically adjustable on said slide and positionablebetween said contact points to hold the plunger in position to dress awheel of greater diameter, and means for varying the thickness of saidblock to vary the position of said dressing tool, substantially as setforth.

1. A. wheel truing fixture, comprising a base, a slide mounted thereon,a plunger in said slide, means for preventing rotation of said plunger,a dressingtool carried by said plunger, means forholding said plunger ina fixed position to dress one wheel, and a block movable to engage theplunger for holding said plunger in another position to dress a wheel ofa different diameter, the said block being adj ustableinthickness,substantially as set forth.

In witness whereof, I have hereunto set my hand at lVayne'sboro,Pennsylvania, this 8th day of March, A. D.,- nineteen hundred andtwenty-eight.

CONRAD L. OTT.

